Report: NSA, GCHQ among worst surveillance offenders, Snowden says

November 4, 2013 3:18 AM

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(CNN) -- Leaked classified documents show the U.S. National Security Agency and its British counterpart are among the "worst offenders" of mass surveillance without oversight, according to an open letter purportedly written by Edward Snowden and published Sunday by the German magazine Der Spiegel.

The publication of the letter, titled "A Manifesto for the Truth," comes as leaks by the former NSA contract analyst have roiled U.S.-European relations amid allegations that the NSA and the UK's Government Communications Headquarters monitored the communication data of some world leaders.